the size of the atom decreases across the period and increase In a group why.
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Across a period, effective nuclear charge increases as electron shielding remains constant. A higher effective nuclear charge causes greater attractions to the electrons, pulling the electron cloud closer to the nucleus which results in a smaller atomic radius.
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As we know across the period from left to write the effective nuclear charge is increase and along the group the orbit number of atom is increase in the form of n². So, along the period the size of atom decrease for the effective nuclear charge and along the group the size increase for increasing orbit number of atom. Hope you understand.
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